Premium
A New Hydroxo‐bridged Chromium(III) Dimer [Cr(saltn)OH] 2 ·4H 2 O: Synthesis, Crystal Structure and Magnetic Properties
Author(s) -
ZhongHai Ni,
YiHua Zhao,
Lei Zheng,
HuiZhong Kou,
AiLi Cui
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200590786
Subject(s) - triclinic crystal system , chemistry , crystallography , chromium , octahedron , antiferromagnetism , dimer , crystal structure , magnetic susceptibility , octahedral molecular geometry , stereochemistry , condensed matter physics , physics , organic chemistry
A new hydroxo‐bridged dimeric Cr(III) complex [Cr(saltn)OH] 2 ·4H 2 O [H 2 saltn= N,N ′‐bis(salicylidene)trimethylenediamine] has been synthesized and its structural and magnetic properties have been investigated. The complex crystallizes in the triclinic space group P ‐1 with one dimeric formula unit in a cell of dimensions a=0.95828(19) nm, b=0.95926(19) nm, c=1.0437(2) nm, α=86.77(3)°, β=82.48(3)°, and γ=64.93(3)°. The geometry around each chromium(III) center is six‐coordinate, distorted‐octahedral. The bridging Cr 2 O 2 unit is strictly planar, as required by the crystallographic symmetry. The CrOCr′ bridging angle is 99.94(16)°, and the distance between Cr…Cr′ is 0.3019 nm. The magnetic susceptibility of the complex has been examined in the range of 2‐300 K. By using the spin‐spin coupled model for an S 1 =S 2 =3/2 dimeric system $({\hat H}=-2J{\hat S}_{1}{\hat S}_{2})$ , the magnetic data were fitted to give the parameters of g =2.01(1), J =‐0.85(2) cm ‐1 , and z J ' =0.18(3)cm ‐1 , indicating the presence of a weak antiferromagnetic spin‐exchange interaction between the Cr(III) ions in the binuclear complex.